Improvement in stop-cocks



JOHN C. CHAPMAN, OF CAMBRIDGEPORT, MASSACHUSETTS.

Letters Patent No. 94,563, dated September 7, 1869,?, Y g

IMPROVEMENT IN STOP-COCKS.

The Schedule referred to in theseLetters Patent and making part of the lame.

To all iuhom 'it may concern Be it known that I, J onN C. CHAPMAN, of Cambridgeport, in the county of Middlesex, and State of Massachusetts, have invented an Improved Valve or Stop-Cock, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figurel is a central longitudinal section through my improved valve or stop-cock.

Figure 2 is a section -thr'ough the centre of the shell oi' the same.

Figure 3 isa transverse dect-ion through the valve, on the une x :u of ngi-1.

My linvention has for its object to improvethe construction, of' valves or stop-Cocks, so that the grinding, hitherto. required to render them tight., may be 'dispensedwitln whereby I am enabled to produce a -gnperiofrarticle at a much less cost than heretofore;

and v .My invention consists in a conical or wedge-shaped plug, which slides within a shell, having its inlet and onder-openings seated or surrounded with a packing of Babbitt or soft metal, against which the plugr is finned lwhen the valve is closed.

To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is the body or shell of t-he valve, having straight unobstructed passage through it, which is closed by a tapering or conical plug, ll, which slides within the por ion 5 of the shell.

This plug Bis advanced'and withdrawn by a screwshaft, Gl, which passes through it, the outerpoxtion of the shaft, above the screw-thread, passing through the cap D and smiling-box E, and carrying, at its extremity, a h;\`n(l\vl|eel, G,'.by which it isv revolved.

b are ribs or projections on the interior` of the shell, which fit into grooves in the plug B, and prevent it from turning; while being moved by the screw-shaft C.

Around the inlet and outlet-'openings d e, on the interior of the shell A, are recesses, which are filled with Babbitt or other soft metal, j, so as to forni seats or packing, against which vthe conica-l plug B is forced, the soft metal yielding, and conforming exactly to the shape of the plug, andthereby iusiu'ing a perfectly' tight joint, without the necessity of grinding the hearing-surfaces, as has, been heretofore necessary in a stop-cock provided with a pl ng and a straight unobstructed passage, and consequently-il alu enabled to furnish a simple and reliable stopwock or valve at a greatly reduced cost. n

It will be seen, that in the above-described'stopcock there is no liabilityof leakage being caused by the wear ol' the plug, Ib the latte-r being tapering or mnical, is always forced vtightly against the soft metal packing, which adapts itself to its form and the inequalities of its surface, so as always to insure a tight joint when the valve is closed.' 1

The plug is, however, exposed to very little wear, as it leaves the soit metal seats as soon as it conlmences to be withdrawn `to open the valve.

Instead of the sliding,r plug B being operated by a screw, as above described, itllnay be moved by means of a lever attachedl to the spindle (l. This latter method would be found welladapted for gas-cocks.

In lieu of the plug B being made in the form of a frustum of a cone, it may be constructed in the form of a wedge, .the shape of the interior of the shell being made to conform thereto.

-Clafim. j v.

What l claim as my'invention, and desire to securr by Letters Patent, is

The tapering plug B, applied to and sliding within the shell A, in combination with the Babbitt or soft metal seats or packing j; at the inlet and outlet-opem ings (Le, substantiallyfas described. y

` JOHN C.' CHAPMAN. Witnesses: v Y

I.v E. TnscHEMAoHEn, W. J. CAMBRIDGE.; 

